Johkt beowhihg exectttob osi sgib john m



May 24,1927.

J. M BRONNING FIRING msch'mislv. PM? AUTOMATIC FIREARMS Filed Sept. 19, 1924 PF 1 1 N HHHHH H Pctented May 24, 1927. 1,629,651 UNITED STATES P'T T ENE... -sroann.' nnownxue,or oonnir, ens; some nnowume mtncuron. on some in. r nnowmne, nscn esnn. v

nmme uncnmilsrs' non. nuiromsr o smnnnms. Application meii sa t moei- 1a, 1924. Serla1No. 738515. A

- The invention relatesgenerally to firin applied to an automatic firearm of the class mechanisms for eutoniatic machine on shown and described in the patent to J. M. more particularly to such mechanisms a apt- Browning, N o. 1,293,021., dated Feb. 4, 1919,' .ed for nse'lwjth. automatic machine guns for automatic machine gun, in which-the inpnnted onnircraftsndsynchronizedtofire breech closing block reeoils together with $0 ehmu h by theypropeller the barrel and barrel extension a. limited dis-; blnd'esfwitho 'Td'blades. tance, after which said block is unlocked' .plejig ef t E ion to prov de and continues its rearward movement against ,inwh1eh; the tension of 'a' reaction spring to open the yneh fi mbggwhileseem 1 held inthe "breech,- after the-recoil of the breech block, i, pqjs ifigq is' ngy i'thelesg edhpted -to' the reaction spring returns it forward and he relea d] thefepplicstion .vofi-n-rsmql in its final forward movement it is again force, it .ngliinglsaid" mechsnism-cs loci-red eguinst the breech oft hebarrel'. In "'Lpeciallyih d fon use with-en electriculi such movements of the breech-block, the firleeisynehrou gemorunder other conditions ing member is-cockecl; thesp'e'nt shell is e'xi.-"i; jwhi' f; fir tracted from the barrel an ejected, and a s n" m sim ,ordesirnble ncw cartrid e insertediginto the barrel ,f iirtl reriobjects ,w become iipchamber so lint everything is ini readiness to the'. 'd escription prooeedsfi T 'h're the next shot. bje'ct's ere-"attliined'by the provision The breech casing within-which the breech .vsljinproved menus-now to be do; block recipiocates is designated as a whole withjthebecompany. by the reference numeral third the breech fin drnwrgisniidmdteb ecificallypointed block by the reference nuineral'2. Parts of on in'the'o si'tns append hereto. the firing mechanism to which the invention 25 In the'drnivi'ngs-zw v l relates are carried by the breech block and Fig. 1 ifepl'e&iants ini 'lefhhnpd side ele'vaparts by the breechcesing. I tion nkportion ofthe breeohcasing of a. In a longitudinally extending seat in the 8" heving 'the" invention applied thereto; the lower portion of the breech-block, the firing left'hnnd'sid'e'of the breech casing is broken pm 3 has n longitudinal reciprocating moveu'wa t'o showv the rear portion of the breech ment, being actuated in forward direction $5 bloc elevation; the rear portion of the by the mom spring 3", 'which transmits its firing 'in is shown inftlotted-lines iii-central tension at its forward end toseiid pin and vertioa longitudinal secfiioniand-the parts at itsrenr end against a vertical abutment of the mechanism 'are in the-firing. position. pin 4. The firing pin is moved rearwardly 35 r! "Fig. grep-resents the upper portion of the to its cocked position in a usuiil manner by I gun in everticztl transverse section taken apthe cocking lover 5, which is pivoted on the proximately on the line 2t2 of Fig. l, as transverse pin 5ondhus its shortlower arm seen from the front- 1 extending into a longitudinal slot in the fir.

Fig. 3 represents the up "er portion-of the mg pm and its long upper arm intoco'open 4n gun m a, verti al trunsv s'e-section taken ative relation with a coclr ng slot in the top my ep roximetely on the line 3-3 of Fig. 1. plate 1*.of the breech casing 1. 'During the i 4 represents the rear portion of the recoil of the breech block 2 after e. breeci block in a left hood side elevation shot. the cocking lever 5 is moved'from the showing the osition of the parts afterthe position shown in Fig. 1 to the position 45 recoil o'fthJb pin is held cooked by the cocking lever. shown resting against an IIIChIIGd shoulder Fig. 5 is a detail view of parts of the 3" on the tiring pin to hold the samein firing mechanism as seen when looking in cocked ositron. The breech block .is rethe direction indicated by the arrow in turned -orward by the usual reaction spring reech block, when the shown in Fig. 4, where its lower arm is-mo- [,u Figg, v .11 guided by the rod 13; in the last of the m5 1 PFig. 6 represents, in a perspective View i'onvard move ient of the breechblock, the and on an enlarged scale, the scar catch and cocking leycr is again moved to its mo en' the spring pressed plunger co-operating atlvc position. 4 v therewith to move it in one direction. To hold the firmg pin cocked after its re- 55 In the drawings; the. invention is shown lease by the cooking lever novel. improvedz-ilw said element having an inclined shouldnr, a pivoted two-armed sear n corms ending shoulder on one arm mhnpiel to be positioned in frqnt of :linml shuuhlel on the firing pin, ms when-by in the muxexnnnt 0 said lament tn the cracked position; said engage-'5, said scanund positively mid' shuuhh-n on the sumo espomling shoulder on the firing pin, l'tmbe'r for nntonmli'cally locking the such position; an automatic 'n'ear'ni. the'cumbinu- 1 reciprocating breech hluck,'a firing ng-lu-t-nnh-(l in gun 1L .riiun and enrsni hhrucr-h.Muck, said pin having ly and inwardly inlinul (-uulung n pivoted sour urried by said duck, and having a mrrvfi mmlingrly shoulder Tur m-ppqr niun with the on said firing 51in; \vln ruhy, when pin is'in cuvhl-l pusilinn. Hm firing ug (ends in swing the scmqjo ils ive pugitimr'; nwnns l'urpositively.

the-sear in Rs UIHI'QUVI' msHiou in in front of 7 tion' of a .rec'xprocuting breech block]. 9

swing-actuated firing n sempivotally curried said brceclr bloc moans fo'r moving said ring in to cc.cke ositiun in the movements 0 said breech flock, means hereby snigl sea: is positively gin gm ried therebfi,

moved to its operative position in the Instoi the vuclging movement ofmid fig-mg ml), and a s rung-actuated.catch f0r'untu1nut1- cplly loc ing said 5904') its operativqpusi- 8. In an (inn of a ln'uerh casing, nummml l'or luugitudmnl hhwk to swingon an axis tunnel to the diuut umntic firearm, the cmilhinfl' u breech block lwlimlof umvmuunl. of sand bveeghlblock, a

luver gm; uvtnuting saidelement Mounted on said casingvt o'swing on a longitudinally extmnlin axis. said lever carrying a-springpre-asec ynwl for engagement mth said elvmcnt. sun] pawl hejng adapted to yield furwan-d1), as and fol-"tho purpose, specifil-d. 4 and witnesmd This spqu'rlicution mgncd this l8th'd uy .Qf segtfxmber. A. D. 1924. JO M. BROWNING. 

